# Optimization of Unbalanced Three Phase Power Distribution Network Ying Teng.

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Optimization of Unbalanced Three Phase Power Distribution Network Ying Teng

Optimization of Unbalanced Three Phase Power Distribution Network Motivation Background Project Goals Reference Current Process/Problem Motivation Background Project Goals Reference Current Process/Problem

Motivation Deeply interested in renewable energy, hold the belief that the whole world will greatly rely on renewable energy in the near future Topic is challenging to me, might be not able to achieve all the goals, but I will try. At this stage, the more I learn the more interested I become into it Deeply interested in renewable energy, hold the belief that the whole world will greatly rely on renewable energy in the near future Topic is challenging to me, might be not able to achieve all the goals, but I will try. At this stage, the more I learn the more interested I become into it

Background of three phase unbalanced problem How does it become a problem? What is the consequence? Why worth researching? How does it become a problem? What is the consequence? Why worth researching?

Background -- How does it become a problem? A large number of unequal single phase loads or resources must be served by distribution network And to make it worse, if these single phase loads or resources are using renewable energy, they sometimes would change dramatically, since it is unpredictable and unstable Moreover, the fact is more and more people begin to use renewable energy A large number of unequal single phase loads or resources must be served by distribution network And to make it worse, if these single phase loads or resources are using renewable energy, they sometimes would change dramatically, since it is unpredictable and unstable Moreover, the fact is more and more people begin to use renewable energy

Background -- What is the consequence? List several consequences it might bring as examples ▫ Substantial Voltage Drop in bus(if large amount of distributed energy resources suddenly kicked in) ▫ Create heavy power flow in certain bus(overload or overheated) ▫ Challenging to predict accurately and timely  Might cause falsely action of breaker or phase shifter and leads to bigger problem ▫ Whole area might black out when hitting the threshold, as professor's example in California List several consequences it might bring as examples ▫ Substantial Voltage Drop in bus(if large amount of distributed energy resources suddenly kicked in) ▫ Create heavy power flow in certain bus(overload or overheated) ▫ Challenging to predict accurately and timely  Might cause falsely action of breaker or phase shifter and leads to bigger problem ▫ Whole area might black out when hitting the threshold, as professor's example in California

Background -- Why worth researching? Provide a robust/high efficient/economic operating power grid by finding out the global optimal solution Provide as a principle and criteria when a large amount of single phase renewable power source would connect to grid Lots more, such as provide relatively quick and accurate solution for ISO Provide a robust/high efficient/economic operating power grid by finding out the global optimal solution Provide as a principle and criteria when a large amount of single phase renewable power source would connect to grid Lots more, such as provide relatively quick and accurate solution for ISO

Project Goals Review and catch up convex optimization fundamentals Understand the papers professor suggested as much as possible Use CVX to solve balanced power flow optimization in MATLAB Duplicate the paper’s results in MATLAB, using toolbox like PSAT/CVX/Matpower Review and catch up convex optimization fundamentals Understand the papers professor suggested as much as possible Use CVX to solve balanced power flow optimization in MATLAB Duplicate the paper’s results in MATLAB, using toolbox like PSAT/CVX/Matpower

Project Goals Trying to move one step forward ▫ maybe add one more constrain ▫ or trying to find out the limitation of the papers. Trying to work in both directions: ▫ network optimization ▫ and power electronics equipment optimization  use more three phase inverter  improve its three phase balance  power quality monitoring unit to collect information about three-phase unbalance factor Trying to move one step forward ▫ maybe add one more constrain ▫ or trying to find out the limitation of the papers. Trying to work in both directions: ▫ network optimization ▫ and power electronics equipment optimization  use more three phase inverter  improve its three phase balance  power quality monitoring unit to collect information about three-phase unbalance factor

Reference Papers: ▫ “Optimal Distributed Voltage Regulation in Power Distribution Networks”, University of California at Berkeley and University of Illinois at Urbana-Champaign ▫ “Economic Dispatch in Unbalanced Distribution Networks via Semidefinite Relaxation”, University of Minnesota Textbook Lecture Notes “Convex Optimization”, by Stephen Boyd, Stanford University; and Lieven Vandenberghe, University of California, Los Angeles Guides Matpower 4.1 User's Manual The CVX Users’ Guide Papers: ▫ “Optimal Distributed Voltage Regulation in Power Distribution Networks”, University of California at Berkeley and University of Illinois at Urbana-Champaign ▫ “Economic Dispatch in Unbalanced Distribution Networks via Semidefinite Relaxation”, University of Minnesota Textbook Lecture Notes “Convex Optimization”, by Stephen Boyd, Stanford University; and Lieven Vandenberghe, University of California, Los Angeles Guides Matpower 4.1 User's Manual The CVX Users’ Guide

Current Process/Problem Review convex optimization fundamentals Using MATLAB to understand and solve typical OPF cases Read reference listed in previous slide Understand Mathematic notations, equations and reasoning in papers Build three phase unbalanced power network and adopt CVX to solve it in MATLAB Much more… Review convex optimization fundamentals Using MATLAB to understand and solve typical OPF cases Read reference listed in previous slide Understand Mathematic notations, equations and reasoning in papers Build three phase unbalanced power network and adopt CVX to solve it in MATLAB Much more…

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